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PDF ASM3P2870A Data sheet ( Hoja de datos )
| Número de pieza | ASM3P2870A | |
| Descripción | Low Power Peak EMI Reducing Solution | |
| Fabricantes | ON Semiconductor | |
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ASM3P2870A
Low Power Peak EMI
Reducing Solution
Description
The ASM3P2870A is a versatile spread spectrum frequency
modulator designed specifically for a wide range of clock frequencies.
The ASM3P2870A reduces electromagnetic interference (EMI) at the
clock source, allowing system wide reduction of EMI of all clock
dependent signals. The ASM3P2870A allows significant system cost
savings by reducing the number of circuit board layers, ferrite beads
and shielding that are traditionally required to pass EMI regulations.
The ASM3P2870A uses the most efficient and optimized
modulation profile approved by the FCC and is implemented by using
a proprietary all digital method.
The ASM3P2870A modulates the output of a single PLL in order to
“spread” the bandwidth of a synthesized clock, and more importantly,
decreases the peak amplitudes of its harmonics. This results in
significantly lower system EMI compared to the typical narrow band
signal produced by oscillators and most frequency generators.
Lowering EMI by increasing a signal’s bandwidth is called ‘spread
spectrum clock generation.’
Applications
The ASM3P2870A is targeted towards all portable devices with
very low power requirements like MP3 players and digital still
cameras.
Features
• Generates an EMI Optimized Clock Signal at the Output
• Integrated Loop Filter Components
• Operates with a 3.3 V / 2.5 V Supply
• Operating Current less than 4 mA
• Low Power CMOS Design
• Input Frequency Range:
13 MHz to 30 MHz for 2.5 V
13 MHz to 30 MHz for 3.3 V
• Generates a 1X Low EMI Spread Spectrum Clock of the Input
Frequency
• Frequency Deviation: ±0.75% (Typ) @ 22 MHz Input Frequency
• Available in 6−pin TSOT−23, 8−pin SOIC and 8−pin TSSOP
Packages
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
http://onsemi.com
TSOT−6
O SUFFIX
CASE 419AF
TSSOP−8
T SUFFIX
CASE 948AL
SOIC−8
S SUFFIX
CASE 751BD
PIN CONFIGURATIONS
1
REFOUT
VSS
XOUT
ModOUT
XIN / CLKIN
VDD
6−Pin TSOT−23 Package
(Top View)
XIN / CLKIN
XOUT
1
VDD
NC
REFOUT
ModOUT
NC VSS
8−Pin SOIC and TSSOP Packages
(Top View)
KEY SPECIFICATIONS
Description
Supply Voltages
Cycle−to−Cycle Jitter
Output Duty Cycle
Modulation Rate Equation
Frequency Deviation
Specification
VDD = 3.3 V / 2.5 V
200 pS (Max)
45/55%
FIN/640
±0.75% (Typ) @
22 MHz
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 10 of this data sheet.
© Semiconductor Components Industries, LLC, 2011
August, 2011 − Rev. 3
1
Publication Order Number:
ASM3P2870A/D
1 page  
ASM3P2870A
Table 7. DC ELECTRICAL CHARACTERISTICS FOR 3.3 V SUPPLY
(Test condition: All parameters are measured at room temperature (+25°C) unless otherwise stated.)
Symbol
Parameter
Min
VIL Input low voltage
VIH Input high voltage
IIL Input low current
IIH Input high current
IXOL XOUT output low current (@ 0.4 V, VDD = 3.3 V)
IXOH
XOUT output high current (@ 2.5 V, VDD = 3.3 V)
VOL Output low voltage (VDD = 3.3 V, IOL = 8 mA)
VOH Output high voltage (VDD = 3.3 V, IOH = 8 mA)
IDD Static supply current (Note 3)
ICC Dynamic supply current (3.3 V, 22 MHz and no load)
VDD Operating Voltage
tON Power−up time (first locked cycle after power−up)
ZOUT
Output impedance
3. XIN / CLKIN pin is pulled low.
VSS−0.3
2.0
−
−
−
−
−
2.5
−
−
2.7
−
−
Typ
−
−
−
−
3
3
−
−
1.2
4.0
3.3
−
45
Table 8. AC ELECTRICAL CHARACTERISTICS FOR 3.3 V SUPPLY
Symbol
Parameter
CLKIN
Input frequency
ModOUT
Output frequency
fd
Frequency Deviation
Input Frequency = 13 MHz
Input Frequency = 30 MHz
tLH (Note 4)
Output rise time (measured from 0.8 V to 2.0 V)
tHL (Note 4)
Output fall time (measured at 2.0 V to 0.8 V)
tJC Jitter (Cycle−to−Cycle)
tD Output duty cycle
4. tLH and tHL are measured into a capacitive load of 15 pF.
Min Typ
13 −
13 −
− ±1.20
− ±0.5
0.4 1.2
0.3 0.8
−−
45 50
Max
0.8
VDD+0.3
−35
35
−
−
0.4
−
−
−
3.6
5
−
Max
30
30
−
−
1.5
1.1
200
55
Unit
V
V
mA
mA
mA
mA
V
V
mA
mA
V
mS
W
Unit
MHz
MHz
%
nS
nS
pS
%
http://onsemi.com
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